Air and oil pressure recoil mechanism for plows



July 3, 1962 P. B. ANDERSON 3,04

AIR AND OIL PRESSURE RECOIL. MECHANISM FOR PLOWS Filed Sept. 22, 1958INVENTOR 3,942,122 Patented July 3, 1962 3,042,122 AIR AND OIL PRESSURERECOIL MECHANISM FOR PLOWS Peter B. Anderson, P.0. Box 40, Southey,Saskatchewan, Canada Filed Sept. 22, 1958, Ser. No. 762,491 2 Claims.(Cl. 172-265) This invention relates to an air and oil pressure recoilmechanism for plows and is a continuation in part of my United Statespatent application for Air Operated Recoil Mechanism for Plows SerialNo. 571,463 filed March 14, 1956, such application now having beenabandoned.

An important object of my invention has been to provide shock absorbingmeans wherein the downward working pressure applied to a plow beam orshank is reduced by the action of my mechanical pressure controllingarrangement as the beam or shank is forced upward.

A further object of my invention has been to use oil and air underpressure over a piston in a cylinder to re ceive the shocks a plow beamis subjected to when in collision with stones and the like while inoperation.

Other objects and advantages inherent in my invention will be apparentfrom the following description of an embodiment thereof and the appendeddrawings wherein:

FIGURE 1 is a vertical view in elevation of the left side of my plowbeam and shock absorbing assembly illustrating the plow shovelcontacting a stone under the sur face of the ground.

FIGURE 2 is a vertical left side view in elevation taken on a line 4-4of FIGURE 1 illustrating the plow beam raised up until the shovel hascleared the stone.

FIGURE 3 is a vertical rear or back view in elevation of my air and oilpressure recoil mechanism for plows in assembly with a plow beam.

FIGURE 4 is a vertical central section in elevation of my air and oilcylinder taken on a line 4-4 of FIG- URE 1 illustrating the cylinderbase and the piston and piston rod, and the rubber compression ring inthe piston ring groove and the rubber buffer between the said piston andthe base plate, and the cylinder head in assembly with the curved end ofthe cylinder supporting column, and the cylinder head gasket and baseplate supporting rods.

FIGURE 5 is a vertical inclined left side view in elevation of the upperend portion of my plow beam illustrating the plow beam piston rodactuating arm projecting from the back of the beam and welded to theplow beam at one end and having an aperture through its other end, and aleft side spool integral with and adjacent the upper and forward end ofthe beam and an aperture through said spool and beam.

FIGURE 6 is a top plan view in elevation of the hammerheaded end of theplow beam illustrating a spool welded to either side of the forward endof the beam.

Like reference numerals refer to like parts throughout the specificationand drawings, and like characters refer to like conventional parts.

Referring to the drawings, an air and oil pressure recoil mechanism forplows according to my invention is an improvement in the constructionand operation of shock absorbing mechanisms for plows.

Construction FIGURES 1, 2 and 3 illustrate the several parts of the plowmechanism in combination, and the method of attaching the plow mechanismto a conventional plow frame cross member A.

The beam 20 has two metal spools 21 welded to its forward or upper end,as seen in FIGURE 6, which makes the beam appear hammer headed, andhence will be termed a hammerheaded beam 20. The hammerhead 20a of thebeam 20 has an aperture 22 through said hammerhead 20a to receive across pin 23, seen in FIGURE 3. There are two arms or bosses 24 Weldedto the cross frame member A, and they are spaced apart to receive thehammerheaded end 20a of the beam 20, and the said arms 24 have apertures25 through their ends to receive the cross pin 23, and the pin 23 ispositioned in the apertures 22 and 25, thus retaining the beam or shank20 in rockable position between the arms 24. On the back of theheammerheaded beam 20 is welded an arm or lug 26, seen in FIGURES l, 2,3 and 5, and the arm 26 has an aperture 27v in its outer end, seen inFIGURE 5, and the clevis 28 of the piston rod 29 spans the. end of thearm 26, and a clevis pin 30 is positioned through and in the apertures31 and 27, thus connecting the beam 20 to the piston rod 29, and thepiston rod 29 is slidably positioned in the piston rod circumferentialbearing 3'2, seen in FIG- URE 4, and the piston rod 29 passes throughthe center of a rubber piston buffer 33, seen in FIGURE 6, and issecured to the center of the piston 34 either integrally or otherwise.The cylinder 35 and assembly comprises a circumferential cylinder base36 having a circumferential flange 37 accurately machined to receive oneend of the piston cylinder, which is machined to a slidable or push fitwithin the flange 37 in order that the cylinder 35 and base 36 andcylinder head 38 be maintained in symmetrical position. The cylinderhead 38 and the base 36 have projecting circumferential flanges,designated by 39 and 40, which have a plurality of rod receivingapertures 41 equally spaced through and around said flanges, and aplurality of rods 42 are positioned in the apertures 41 having nuts 42ain order to draw the cylinder head down on the gasket 43 andsimultaneously clamp the cylinder 35 between the cylinder base 36 andcylinder head 38; the cylinder head 38 has two lugs 44 and the uppercurved end 4511 of the column 45 is positioned between the lugs 44, anda pin 46 connects the cylinder head 38 to the curved head 45a of thecolumn 45. This whole assembly of the piston mechanism is plainlyillustrated by FIG- URE 4 of the drawings. .The base of the column 45bis welded to the conventional cross member A and the beam stop 47 isWelded to the column 45. The piston 34 has a ring groove 48 toaccommodate a rubber compression ring 49. An air valve 59 is positionedin the top of the cylinder 35 seen in FIGURE 4. A tillage shovel B isbolted to the bottom end of the beam 20 by one or more bolts C.

Operation The plow is travelling in the direction indicated by the arrowF, and the shovel B on the end of the plow beam 20 has collided underthe surface of the ground G with a stone D seen in FIGURE 1, and FIGURE2 illustrates the plow beam 20* with the shovel B raised up to allow thebeam shovel B to ride over the stone D, and during the upward travel ofthe beam 20 the beam arm 26 has shoved the piston rod 29 and piston '34upward against the air and oil pressure within the cylinder 35. When theshovel B has cleared the stone D, the downward pressure of air on thepiston will return the plow beam 20 and shovel B downward into operativeposition. During the foregoing movements, the air pressure within thecylinder received the shock from the plow beam 2d caused by the shovel Bstriking the stone D. An important functioning of this inventiondifferent from the prior art is that as the shovel end of the beam 20 isbeing forced upward against the downward pressure of the piston rod 29,which piston rod is in turn forced downwardly by the piston 34 which isunder air and oil pressure, the beam travels in a semi circular movementwhile being forced upward, and as the beam 20 and arm 26 swing upwardlyagainst the pressure from the air operated piston the beam 20 gains anadvantage over the downward pressure of the piston as illustrated inFIGURES 1 and 2. Note the semi circular line 56 and that the pistonoperating arm 26 has travelled along this line 56 from a point 54 untilthe arm 26 was stopped by the stop 47, and during this upward movementof the beam 20 and the arm 26 the downward pressure of the piston to theshovel end of the beam 20 progressively becomes less as the beam orshank 20 rises, and when the beam or end of the arm 26 on its upwardtravel has reached a point on the line 26 designated by 51 the shovelend of the beam 20 has already gained a substantial leverage on thedownward pressure of the piston thrust to the end of the beam arm 26,and in order to more clearly visualize this fact note the length of thedotted line 53 in FIGURE 1 when the beam 20 is down in operation andreceiving the full power or pressure from the piston, then note thelength of the dotted line of leverage 52 which is less than half theleverage the piston has on the shovel end of the beam 20 as shown by thedotted line 5 3 in FIGURE 1. The dotted line 55 seen in FIGURE 2indicates the direction of piston rod downward thrust as it meets theline 52, to further explain the much less leverage or power the pistonhas on the shovel end of the beam 20 when the beam is up as illustratedin FIGURE 2. The shovel end of beam 20 receives the maximum. Workingpressure when in operative position. While the illustrations of thecylinders 35 in the drawing had to be made short, it is to be understoodthat the cylinders should be much longer in order that the piston 34 onits upward travel will increase the air and oil pressure but verylittle. I use oil and air pressure, not hydraulic fluid in the cylinders35 and the air is pumped into the cylinders through an air valve 50'seen in FIGURE 4. The beam 20 may be called a T or hammerheaded plowbeam.

It will be understood, of course, that modifications may be made in thepreferred embodiment of the invention described and illustrated hereinwithout in any way departing from the spirit and scope of the inventionas defined by the appended claims.

Having thus described my invention, what I claim and desire to protectby Letters Patent of the United States is:

1. In a soil working plow structure including a cross frame member, andhaving a cylinder adapted to receive and retain therein air underpressure and including a piston for the cylinder and a piston rodconnected therewith, arms fixed on the cross frame member projectingrearward and downwardly inclined, a shovel carrying plow beam having itsupper end attached to the cross frame member arms pivoted to movevertically, said plow beam having an integral arm rearwardly projectingtherefrom, an upstanding column fixed on the cross frame member, meanspivotally suspending the cylinder from said column, and means pivotallyattaching the piston rod for the cylinder to the plow beam arm, saidcylinder when the piston rod is so attached inclining rearwardly fromthe vertical when the shovel carrying plow beam is in working relationto the soil with said cylinder movable towards the vertical when theplow beam moves upwardly, and with the leverage exertable on the pistonrod by the plow beam through the integral arm thereon decreasing as thepressure within the cylinder of air compressed by the piston increases.

2. A plow beam structure as set out in claim 1 in which when the shovelon the plow beam is in working relation to the soil the pivotalconnections of the plow beam and cross frame member and of the pistonrod and plow beam arm are substantially on a horizontal level.

References Cited in the file of this patent UNITED STATES PATENTS1,046,090 Liebau Dec. 3, 1912 1,398,859 Hurtig et a1 Nov. 29, 19211,692,035 Gruss Nov. 20, 1928 2,228,865 Bird Jan. 14, 1941 2,379,779 AshJuly 3," 1945 2,405,980 Sands et a1. Aug. 20, 1946 2,679,793 Rolf et al.June 1, 1954 2,690,111 Altgelt Sept. 28, 1954 2,850,956 Rogers et a1.Sept. 9, 1958 FOREIGN PATENTS 1056/26 Australia Apr. 9,1926 448,671Italy May 23, 1949 35,780 Sweden Nov. 12, 1913

